Omron Communication Messages Dialog
The Comm Messages button will display the following information about an Omron driver tag.
|
|
Displays the full driver name and version. Data may be displayed in any of the 4 types shown.
The Hold Data button will freeze the display. Otherwise the dialog updates continuously as messages are transmitted.
Messages will be logged to a text file while the Start Recording button is pressed. The text file will be created automatically and saved into your application directory. Data will be saved in the format; "YYYY-MM-DD-HHMMSS.txt" (for example, "2001-06-29-150555.txt" indicates that the data was logged on June 29, 2001, at 3:05:55).
Number Transmitted and Received provides a running count of messages in each direction.
Transmit & Receive display communications data using the data type selected above. The Index helps locate each byte within a message.
|
If one has the protocol information for the Omron PLC, one can interpret each of the transmitted and received bytes to determine their meaning. The basic information that can be obtained from the Communication Messages window is that communications are proceeding as normal as long as bytes appear in both the Transmit and Receive columns.
If bytes appear in the Transmit column but not in the Receive column, VTS is trying to poll the PLC for data (sending a read request) but the PLC is not responding. In this case it is wise to check the properties of the Omron driver tag (station address, comm. channel, etc.) to make sure all settings are correct. See: Omron Host Link Driver Tags.